39 lines
1.6 KiB
Nix
39 lines
1.6 KiB
Nix
{ lib }:
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# This Nix expression allows filtering a local directory by specifying dirRootsToInclude, dirsToExclude and filesToInclude.
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# It also filters out symlinks to result folders created by nix-build, as well as backup/swap/generated files
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let
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inherit (lib)
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any compare compareLists elem elemAt hasPrefix length min splitString take;
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isPathAllowed = allowedPath: path:
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let
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count = min (length allowedPathElements) (length pathElements);
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pathElements = splitString "/" path;
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allowedPathElements = splitString "/" allowedPath;
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pathElementsSubset = take count pathElements;
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allowedPathElementsSubset = take count allowedPathElements;
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in (compareLists compare allowedPathElementsSubset pathElementsSubset) == 0;
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mkFilter = { dirRootsToInclude, # Relative paths of directories to include
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dirsToExclude ? [ ], # Base names of directories to exclude
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filesToInclude ? [ ], # Relative path of files to include
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filesToExclude ? [ ], # Relative path of files to exclude
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root }:
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path: type:
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let
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baseName = baseNameOf (toString path);
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subpath = elemAt (splitString "${toString root}/" path) 1;
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spdir = elemAt (splitString "/" subpath) 0;
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in lib.cleanSourceFilter path type && (
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(type != "directory" && (elem spdir filesToInclude) && !(elem spdir filesToExclude)) ||
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# check if any part of the directory path is described in dirRootsToInclude
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((any (dirRootToInclude: isPathAllowed dirRootToInclude subpath) dirRootsToInclude) && ! (
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# Filter out version control software files/directories
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(type == "directory" && (elem baseName dirsToExclude))
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)));
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in mkFilter
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